Hi Firebabe,
I have no experience with methotrexate, but others here do. All I know is that when I'm photographing a wedding, I have the stamina and physical strength of someone who is perfectly 100% healthy. It's the adrenaline. So I would say, for you, DEFINITELY an adrenaline rush will make you feel a lot different!!!
I'm the same with the laundry. I feel like I'm 90 years old when I'm climbing those stairs with the baskets. Yet, when I'm out shooting, I'm like Wonderwoman. It's weird.... Like I'm living in two separate bodies....
I think the fatigue, for me anyway, is always there. But when I'm spouting off adrenaline in every direction, that fatigue is gonzo!!!
Ginny